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trincea gaat @tutti @Wire SAMUEL VANS'IONE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO I-IIMSELE AND JOI-IN W. HOARD, OF SAME PLACE Lagers Patent Nofooaz, dazed May 18, 1869.

The Schedule referred to in' these Letters Patent and making part o! the same.

To all whom it may concern Be it known that I, SAMUEL VANsroNE, of the city and county of Providence, in the State of Rhode Island,

have invented a new and improved Mode of Forming 'lubes; and I do lhereby declare that the following specification, taken in connection with the drawings,

lmaking apart ofthe same, is a full, clear, and exact description thereof.

' Figure 1 represents-my improved tube.

Figure 2 is a transverse section of the same. Figure 3 is'a horizontal section;l My invention embraces the forming oi' tubes of all kinds, as hereinafter described, having, however, especial reference to that class Yknown as steam and gaspipe, and has for its object the production of an article which, in pointl of durability and strength, shall be superior to others now in use, and, at the same time,

brings together and firmly unites the edges, and at the same time reducesthe pipe to a circular-shape, in the manner already well understood.

This method of forming the tubes is open to several objections, among which are the crimping of the iron, the insufficiency of the weld in point of strength, and the time consumed in the manufacture of the same,

These objections I overcome inl my invention, which I will now proceed to describe.

I first make my tube in two sections, each of which is rolled into a half, or nearly half-circular form, as

shown in iig. 3, and provided with two anges, ae', for the purpose of welding, hereinafter described.

The sections may, however, be brought intoy the desired shape by the crimping process, as in the old method, before referred to, which I discard, both on account of the length of time it requires, and its tendenoy to weaken the iron. l

I next place the two sections together, as shown in gs. 1 and 2, and heat the pipe thus formedA until it reaches a welding-beat, when it is taken out, and passed endwise between two rollers, provided with an annular groove, so that the pressure is mostly received upon the ianges, and welds them rmly together.

Whenever it is desired to remove the rim thus left upen the tube, though materially" lessening its strength, it may easily be done while it is passing through the rolls, as before described, by the arrangement of suitable cutters in connection with the same.

What I claim as my invention, and desire to` secure by Letters Patent, is

The method, herein described, of forming tubes or pipes, by rolling each half of the blank with corresponding auges, and welding the said flanges together, in the manner specified.

' SAMUEL VANSTONE.

Witnesses: A 'l W. B. VINCENT, J ons D. W. TAYLOR. 

